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the chrome console tells me the error is in the last line i copied, but i don't undertand what kind of error it is.

using chrome console (specifically the "network" one), i see that it's written in red, status/text "failed", type "undefined" size/content "13 B / 0 B"; when it works it's: status/text "200/OK", type "text/json", size/content "256 B/ 38B". i'm not an expert with this, is there some more information that could be useful?

the code fires a netbeans function, that stores data to a postgresql database, so i have like 100 variables that has to be stored when i click on the "save button".

Actually before i put parentNode.insertBefore, there used to be appendChild(s), but then i found out this algorithm from google analytics, which seems to be working better than the previous one. Having said that, i can tell you that the GET works after the first time i click perfectly, with some weird things happening, like if i browse another tab for a while, then go back to the page, and click on save, it won't work again (same error).

document.head.appendChild(s);
instead of parentNode.insertBefore(s,h), but it still behaves the same way.

Still not any suggestions? This is part of the javascript file loading on my page, and since the function setMisDatos is in netbeans and it works correctly as soon as it's fired (at least, that's what i notice after the first click), i don't think it's worth copying part of it here, right? are there maybe too many variables for the GET method? is there a way to check GET errors? i'm sorry for not being an expert but i would really like some help here.